JP2000219182A - Scooter-type motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a final assembling line as well as improve assemble workability of a scooter-type motorcycle having a front wheel to be attached through a swing arm. SOLUTION: A scooter-type motorcycle 1 is provided with a front wheel 3 to be attached to the front part of a vehicle body frame 2 through a swing arm 33, and a head pipe 52. A foot placing step floor 15 is placed on the intermediate part 2M of the vehicle body frame 2, and a rear wheel 7 is attached to the rear part of the vehicle body frame 12 through a swing-type power unit 6. The vehicle body frame 2 has a structure in which a rear frame 2R is connected to a front frame 2F so as to be divided in the lower position of the step floor 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scooter type motorcycle in which a front wheel is mounted via a swing arm, and more particularly to an improvement of a body frame of the motorcycle.

[0002]

2. Description of the Related Art Techniques relating to a scooter type motorcycle in which a front wheel is mounted via a swing arm include, for example,
Japanese Unexamined Patent Publication No. 2-175483 discloses "a front wheel suspension device for a scooter type vehicle". According to the above prior art, according to FIGS. 1 and 2 of the publication, a pair of left and right floor pipes 2 provided with a footrest plate 17 (numbers quoted in the publication; hereinafter the same). , 2 upward from the rear end of the rear frame 3
A rear wheel 5 is attached to the rear frame 3 via rear arms 4a and 4b, an engine 8 is mounted at the rear of the floor pipes 2 and 2, and a rising pipe 10 extends upward from the front end of the floor pipes 2 and 2. , 10 and these standing pipes 1
A head pipe 12 is attached to upper ends of the pipes 0, 10 via stays 11, 11, and a bar handle 15 is supported on the head pipe 12, and the under brackets 20, 20 extend forward from the front ends of the floor pipes 2, 2. The scooter-type motorcycle has a lower arm 21 attached to the under brackets 20, 20 so as to be able to swing up and down, and a front wheel 31 attached to a front end of the lower arm 21.

[0003]

The above-mentioned prior art is characterized in that the floor pipes 2 and 2 have a rear frame 3, an upright pipe 10,
By joining the 10, the stays 11, 11, the head pipe 12, and the under brackets 20, 20, an integrated frame 1 is obtained. The rear wheel 5 is assembled to the frame 1 integrated as described above via a rear suspension system including the rear arms 4a and 4b, the hydraulic shock absorber 6, and the like.
The front wheel 31 is assembled via a front suspension system including the lower arm 21 and the hydraulic shock absorber 38, and a steering system such as the bar handle 15, the shaft 40, and the steering arm 30 is assembled.

In order to assemble a scooter-type motorcycle, generally, a front / rear suspension system and a steering system are assembled to a frame 1 on a final assembly line. Since various members are assembled on the relatively large frame 1, the work space is large. If the work space is large, the range of action of the worker is widened and the burden on the worker is increased, so there is room for improvement. In addition, since all the components are assembled on the frame 1 in the final assembly line, the final assembly line must be large and complicated.

Further, standing pipes 10 and 10 and under brackets 20 and 2 are provided at the front ends of the floor pipes 2 and 2, respectively.
0 is welded. Because it is welding,
Under brackets 20 for supporting lower arm 21
It is not easy to manage the dimensional accuracy of the pivot position and the position of the head pipe 12. Therefore, management man-hours increase.

Accordingly, an object of the present invention is to provide a scooter type motorcycle in which a front wheel is mounted via a swing arm.
(1) To improve the assembling workability and simplify the final assembling line; and (2) To facilitate the management of the dimensional accuracy of the pivot position of the stay supporting the swing arm and the position of the head pipe.

[0007]

In order to achieve the above object, a first aspect of the present invention is to attach a front wheel to a front portion of a vehicle body frame via a swing arm and a head pipe, and to mount a footrest on an intermediate portion of the vehicle body frame. Place the step floor,
A scooter-type motorcycle in which the rear wheels are attached to the rear of the body frame via a swing-type power unit, characterized in that the body frame is connected to the front frame so that the rear frame can be split at a position below the step floor. And

[0008] A front suspension system on the front frame,
The steering system and the front wheels are partially assembled to obtain a front subassembly. A swing type power unit and a rear wheel are partially assembled to the rear frame to obtain a rear partial assembly. The resulting front and rear subassemblies are assembled to complete a scooter type motorcycle. Since the front and rear parts are separately assembled, assembly workability is enhanced. In the final assembly line, the rear frame may be connected to the front frame that has been partially assembled separately, so that the final assembly line can be simplified.

According to a second aspect of the present invention, a front wheel is mounted on a front portion of the vehicle body frame via a stay and a swing arm which has a head pipe and extends forward, and a foot step floor is mounted on an intermediate portion of the vehicle body frame. A scooter-type motorcycle in which a rear wheel is attached to a rear part of a vehicle body frame via a swing type power unit, wherein a front part of the vehicle body frame is integrally cast including a head pipe and a stay.

[0010] Since it is an integrally cast product, the position of the head pipe and the position of the stay with respect to the body frame are naturally determined when the front portion of the body frame is formed. As a result, the pivot position of the stay that supports the swing arm is naturally determined with respect to the position of the head pipe. Therefore, it is easy to manage the dimensional accuracy of the position of the head pipe and the position of the pivot.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left”, “right”, “up”, and “down” follow the direction viewed from the driver, and Fr indicates the front side, Rr indicates the rear side, L indicates the left side, and R indicates the right side. Also, the drawings should be viewed in the direction of reference numerals. FIG. 1 is a left side view of a scooter type motorcycle according to the present invention. A scooter-type motorcycle 1 (hereinafter, simply referred to as “motorcycle 1”) has a swing-arm type in which a frame-shaped body frame 2 is disposed at a lower center and a front wheel 3 is suspended at a front portion of the body frame 2. A front suspension system 4 and a steering system 5 different from the front suspension system 4 are mounted, and a rear suspension system 8 for suspending a swing type power unit 6 and a rear wheel 7 is mounted at the rear of the body frame 2. At the top of the rear, seat 9
Is attached. The power unit 6 uses the engine 6a as a drive source.

The motorcycle 1 further includes a front fender 11, a front cover 12, a handle cover 13, a leg shield 14 for covering the driver's legs, and
Step floor for driver's footrest (low floor footrest board) 1
5, under cover 16, center cover 17, rear cover 18, and front and rear two rear fenders 19F, 19R. Step floor 15 is leg shield 1
4, a resin product integrally formed with the vehicle body frame 2.
Is mounted on the intermediate portion 2M of the above and screwed.

The body frame 2 has a dividing line W at its intermediate portion 2M, that is, at a position below the step floor 15, and at the position of the dividing line W, the rear frame 2R is connected to the front frame 2F so as to be able to be divided. Things. The detailed configuration of the body frame 2 will be described later. Further, the body frame 2 has a main stand 93 and a side stand 95 attached to a lower rear portion. These stands 9
3, 95 will be described later. In the figure, 2
1 is a mirror, 22 is a headlamp, 23 is a blinker, 2
4 is a radiator, 25 is a carrier, 26 is a tail lamp, 27 is an exhaust pipe, and 28 is a muffler.

FIG. 2 is a left side view around the body frame according to the present invention. The front suspension system 4 extends a stay 31 forward from a front portion of the body frame 2, and allows the base end of a substantially inverted U-shaped swing arm 33 in a side view to swing up and down with a front pivot shaft 32 on the stay 31. The axle holder block 35 is attached to the front end of the swing arm 33 via a king pin 34 so as to be able to turn left and right, and the front wheel 3 is attached to the axle holder block 35 via an axle 36 so as to be rotatable. That is, the swing arm 33 extends forward from the front portion of the body frame 2, and the front arm 3 is cantilevered by the swing arm 33.

The front suspension system 4 includes a resin spring 43 for reducing the impact of the swing arm 33 in the swing direction, that is, the impact from the road surface, and a front damper 47 for reducing the amplitude of the swing arm 33 in the swing direction. And are separated. For more information,
A resin spring 43 for reducing the impact of the swing arm 33 in the swing direction is interposed between the body frame 2 and the swing arm 33, and the swing arm 33 is suspended by a front damper 47 at the front of the body frame 2. is there. The resin spring 43 is a buffer member made of a resin block having elasticity so as to perform a spring action.

Specifically, the mounting structure of the front damper 47 is such that one end of the front damper 47 is mounted on the right side (rear side in the drawing) of the base of the head pipe post 51, which will be described later, by a pivot shaft 48. The other end of
The swing arm 33 is attached to the left side of the top by a pivot shaft 49. Note that one end of the front damper 47 may be directly attached to the vehicle body frame 2.

The steering system 5 has a head pipe post 51 extending obliquely forward and upward from the front upper portion of the body frame 2, and a head pipe 52 provided at the tip of the head pipe post 51.
A vertically-oriented steering stem 53 is attached to the head pipe 52 so as to be rotatable left and right, a bar handle 54 is attached to an upper end of the steering stem 53, and a steering arm 5 is attached to a lower end of the steering stem 53.
The nose knuckle 35a of the axle holder block 35 is connected to the distal end of the steering arm 55 via a link mechanism 56 so that the front wheel 3 can be steered. 57 is a grip.

As described above, the swing arm type front suspension system 4 is employed, and a large load from the front wheels 3 is received by the highly rigid body frame 2 via the swing arm 33 and the front pivot shaft 32. Thus, a large load can be reliably and effectively received by the body frame 2. Therefore, a large load does not act on the head pipe post 51.

The rear suspension system 8 extends a rear arm 61 from the rear end of the body frame 2 to the rear upper part, bolts a stay 62 to the rear arm 61, and swings the power unit 6 up and down with a rear pivot shaft 63 to the stay 62. , A rear wheel 7 is mounted on the power unit 6, and the power unit 6 is suspended on a rear arm 61 by a rear cushion 64. Rear cushion 64
Is arranged in front of the rear wheel 7 on the drawing, one end is attached to a mounting boss 65 of the rear arm 61 by a pivot shaft 66, and the other end is attached to a stay 6b of the power unit 6 by a pivot shaft 67. .

FIG. 3 is a plan view of the vehicle body frame, front / rear suspension system and steering system according to the present invention. This figure shows that (1) the swing arm 33 extends forward from the front part of the body frame 2 while bending rightward so as to bypass the front wheel 3, and (2) steering from the head pipe 52 at the center CL of the body. Arm 55 with front wheel 3
Extending forward while curving to the right to bypass
(3) This indicates that the power unit 6 extends rearward from the rear portion of the body frame 2 and the rear wheel 7 is cantilevered by the power unit 6. Swing arm 33 to body center CL
From the power unit 6 to one side (right side)
Is offset from the vehicle body center CL to the other side (left side), so that the motorcycle 1 has a good right and left weight balance.

FIG. 4 is an exploded perspective view of the front suspension system according to the present invention. This figure illustrates the structure of the front suspension system 4 in more detail, and includes pivot holes 31a, 31 of left and right stays 31, 31.
A support pipe 33a of the swing arm 33 is attached to the front pivot shaft 32, and the holding plate 41 is connected to the connecting portions 33c, 33c formed on the plate portion 33b of the swing arm 33 by two upper and lower bolts and nuts 42, 42. The resin spring 43 is sandwiched between the plate portion 33b and the holding plate 41, and the mounting plate 44 is inserted into the mounting hole 43a of the resin spring 43.
, The left and right ends of the mounting plate 44 are attached to the mounting bosses 45 of the body frame 2 with bolts 46, and one end of the front damper 47 is pivoted to the mounting boss 51 a at the base of the head pipe post 51. This shows that the other end of the front damper 47 is mounted on the mounting boss 33d on the top of the swing arm 33 by the pivot shaft 49.

FIG. 5 is a left side view of the vehicle body frame according to the present invention, and shows a specific configuration of the vehicle body frame 2. The dividing line W of the vehicle body frame 2 is a line extending obliquely rearward from the upper surface of the substantially horizontal vehicle body frame 2 when viewed from the side. The body frame 2 can be divided into a front frame 2F and a rear frame 2R at the position of the division line W. Rear frame 2
R is a rear arm 61 extending continuously from the rear end when viewed from the side.

FIG. 6 is a plan view of the front frame 2F, that is, the front portion of the vehicle body frame, as viewed in the direction indicated by the arrow 6 in FIG. The front frame 2F includes left and right side members 71, 71.
A front cross member 72 extending between the front ends of the side members 71, 71, and a rear cross member 73 extending between the rear ends of the side members 71, 71.
It is a substantially rectangular frame member in plan view, and furthermore, left and right stays 31, 31 formed by extending the front ends of the side members 71, 71 forward and obliquely forward from the upper front part of the front cross member 72. Head pipe post 5 extending upward
1 and the head pipe 52 provided at the tip of the head pipe post 51 are integrally cast.

The front part of the body frame 2 is
1, since the head pipe post 51 and the head pipe 52 are integrally cast, the stays 31, 31 are fixed to the body frame 2 when the front part of the body frame 2 is formed.
And the position of the head pipe 52 are naturally determined. As a result, the positions of the pivot holes 31a, 31a of the stays 31, 31 that support the swing arm 33 (see FIG. 2), that is, the pivot positions are naturally determined with respect to the position of the head pipe 52. Therefore, the head pipe 52
It is easy to manage the dimensional accuracy of the position and the pivot position.

Further, by extending the front ends of the side members 71, 71 further forward, the left and right stays 3 are provided.
1, 31 and these stays 31, 3
Since the front portion of the vehicle body frame 2 including the front member 1 is an integrally cast product, a large load acting on the stays 31, 31 from the front wheel 3 via the swing arm 33 shown in FIG. It can be transmitted and received by the entire body frame 2. Since the entire body frame 2 receives the load, the whole body frame 2 can be made a reasonable and thin member. As a result, the weight and cost of the body frame 2 can be reduced. Such a front frame 2F is, for example, a die-cast product of an aluminum alloy.

Since the front frame 2F is a frame member having a substantially rectangular shape in plan view, the rigidity of the front frame 2F can be increased. The left and right side members 71, 71 have divided surfaces 74, 74 on the rear upper surface, and four divided bolt holes 75 (... indicate a plurality; the same applies hereinafter) in these divided surfaces 74, 74. It is open.

FIG. 7 is a view taken in the direction of arrow 7 in FIG. 5, and shows the rear structure of the rear frame 2R, that is, the rear portion of the vehicle body frame. As described above, the rear frame 2R is formed by extending the rear arm 61 continuously from the upper portion of the rear end. The rear frame 2R and the rear arm 61 are connected to the left and right side members 8.
, 81, a lower cross member 82 bridged between the rear lower ends of the side members 81, 81, and an upper cross member 83 bridged between the upper ends of the side members 81, 81.
This is a substantially rectangular frame member as viewed from the rear. And
The rear frame 2R is an integrally cast product including the rear arm 61. Such a rear frame 2R is, for example, a die-cast product of an aluminum alloy. Since the rear frame 2R and the rear arm 61 are frame members having a substantially rectangular shape in rear view, the rigidity of the rear frame 2R can be increased.

The left and right side members 81, 81 have split surfaces 84, 84 (see FIG. 5) on the lower surface of the front part, and open four connecting bolt holes 85 in these split surfaces 84, 84.
Further, four power unit stay mounting bolt holes 86 are formed on the rear surface, and four stand bracket mounting bolt holes 88 are formed on the rear lower slopes 87, 87. The left side member 81 is provided with a rear cushion mounting boss 65 on the upper side. P is the center of the rear pivot axis for the power unit.

FIG. 8 is a side sectional view of a joint portion of the vehicle body frame according to the present invention, in which a dividing surface 74 provided at the rear end of the front frame 2F and a dividing surface 8 provided at the front end of the rear frame 2R.
4 are superimposed, and are connected by bolts / nuts 89 passed through the connecting bolt holes 75, 85,. In this manner, the rear frame 2R is added to the front frame 2F by the dividing line W
Can be connected dividably at the position. Division line W
Is made oblique, the pitch (separation distance) between the bolts and nuts 89, 89 can be increased. Therefore,
The coupling rigidity between the front frame 2F and the rear frame 2R can be increased.

FIG. 9 is a rear view of the structure in which the main stand is attached to the rear frame according to the present invention.
The left and right stand brackets 9 are attached to the rear ends (rear lower slopes 87, 87) of the left and right side members 81, 81.
1, 91 are attached with bolts 92, and left and right stand brackets 91, 91 are provided with a main stand 9 having a rear view gate shape.
3 is attached so as to be able to swing back and forth, and further, the side stand 95 is attached to the left stand bracket 91 so as to be able to swing back and forth.

Since the body frame 2 has a high rigidity, the main stand 93 can be swingably mounted with only the left and right stand brackets 91, 91. Therefore,
The conventionally required supporting pipe extending in the vehicle width direction can be eliminated, and the vehicle can be reduced in weight.
The main stand 93 is provided with a foot portion 96 extending left rearward from the left rear portion, and the main stand 93 can be erected by the foot portion 96. 97,9
8 is a tension spring.

Next, the procedure for assembling the motorcycle 1 having the above configuration will be described with reference to FIG. FIG. 10 is an explanatory diagram of the assembling procedure of the scooter type motorcycle according to the present invention. (1) First, in the first partial assembly line, the front suspension system 4 such as the swing arm 33 and the front wheel 3 and the steering system 5 are partially assembled to the front frame 2F to obtain a front partial assembly 1F. (2) In the second partial assembly line, a rear suspension system 8 such as a swing type power unit 6, a rear wheel 7, a rear cushion 64, and a main stand 93 are partially mounted on the rear frame 2R, and a rear partial assembly is formed. Obtain stereo 1R. In this process, the sheet 9 indicated by the imaginary line is used.
Etc. may be assembled. (3) Next, the divided surface 84 of the rear frame 2R is superimposed on the divided surface 74 of the front frame 2F and bolted together, thereby obtaining the front partial assembly 1F and the rear partial assembly 1R obtained respectively. Is assembled into a semi-finished vehicle. (4) Finally, in the final assembly line, various members such as accessories, lamps, and covers are assembled to the semi-finished vehicle to complete a scooter-type motorcycle.

As described above, since the motorcycle is a scooter-type motorcycle that is separably coupled, the front part assembly 1F and the rear part assembly 1R are separated into separate small-scale first and second partial assembly lines. Can be assembled. Since the front and rear subassemblies 1F and 1R are smaller than the completed vehicle, the work space for assembling the parts is small. If the work space is small, the range of action of the worker will be narrow,
The burden on the worker can be reduced. Therefore, assembling workability is further improved. Moreover, the front / rear subassembly 1
The F, 1R can be assembled at any location that is most optimal and separate from the final assembly line. For example, the front and rear sub-assemblies can be assembled at a manufacturing factory of each part constituting these assemblies.

Since the rear wheel 7 and the main stand 93 are partially assembled to the rear frame 2R, during the second partial assembly line, the rear subassembly 1R is assembled during the assembling without any special support jig. After the attachment, the frame 2R can be placed in a stable and independent state.

In the final assembly line, the rear frame 2R may be connected to the front frame 2F separately and partially assembled.
The final assembly line can be simplified, and the degree of freedom in design for arranging the final assembly line in a limited space can be increased. Further, the work space is larger in the final assembly line than in the first and second partial assembly lines. If the work space is large, the range of action of the worker is wide, and the burden on the worker is likely to increase,
The rear frame 2R is added to the front frame 2F which is partially assembled separately.
Are combined, the number of assembly steps in the final assembly line is reduced, and as a result, the burden can be reduced.
Further, since the rear frame 2R is joined to the separately assembled front frame 2F at a position below the step floor 15 (see FIG. 1) having the best assemblability, the assembling workability is further enhanced. .

FIGS. 11A and 11B are modified examples of the front frame according to the present invention. FIG. 11A shows the left side configuration of the front frame, and FIG. The configuration of the direction is shown. The front frame 2F of this modification is characterized in that left and right stays 31, 31 extending forward are integrally formed at the front of a front cross member 72. The other configuration of the previous frame 2F is the same as the configuration shown in FIGS. 5, 6, and 8, and is denoted by the same reference numerals, and description thereof will be omitted.

In the above embodiment of the present invention,
The drive source of the power unit 6 is not limited to the engine 6a, and may be, for example, an electric motor or a hybrid of the electric motor and the engine 6a. The vehicle body frame 2 according to the first aspect of the present invention includes a front frame 2F.
In this case, the rear frame 2R may be divided at the position below the step floor 15, and may be formed into a cast product. The vehicle body frame 2 according to the second aspect of the present invention is not limited to a die-cast product of an aluminum alloy, as long as at least the front portion is an integrally cast product including the stay 31 and the head pipe 52. The division into the front frame 2F and the rear frame 2R is optional.

[0038]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, the vehicle body frame has a structure in which the front frame and the rear frame are dividably connected at a position below the step floor, so that the front frame is partially assembled with the front suspension system and the steering system. And a swing type power unit is partially assembled to a rear frame to form a rear partial assembly, and a front partial assembly is assembled to a rear partial assembly to provide a scooter type motorcycle. Can be completed.

Accordingly, the front subassembly and the rear subassembly can be assembled on separate small-scale subassembly lines. Since the front and rear sub-assemblies are smaller than the completed vehicle, the work space for assembling each component is small. If the work space is small, the range of action of the worker is narrowed, and the burden on the worker can be reduced. Therefore, assembling workability is further improved. Moreover, the front
The rear subassembly can be assembled at any of the most optimal locations apart from the final assembly line.

In the final assembly line, the rear frame may be connected to the separately assembled front frame, so that the final assembly line can be simplified and the final assembly line can be arranged in a limited space. , The degree of freedom in design can be increased. In the final assembly line,
Large working space compared to partial assembly line. If the work space is large, the range of action of the worker is widened, and the burden on the worker is likely to be large.However, the rear frame is connected to the front frame that has been partially assembled separately, so that it is assembled on the final assembly line. The number of steps is reduced, and as a result, the burden can be reduced. Further, since the rear frame is joined to the front frame which is partially assembled separately at a position below the step floor where the assembling property is best, the assembling workability is further improved.

According to a second aspect of the present invention, the front portion of the vehicle body frame is formed as an integral casting including the head pipe and the stay.
When the front part of the body frame is formed, the position of the head pipe and the position of the stay with respect to the body frame are naturally determined. As a result, the pivot position of the stay that supports the swing arm is naturally determined with respect to the position of the head pipe. Therefore, it is easy to manage the dimensional accuracy of the position of the head pipe and the position of the pivot.

[Brief description of the drawings]

FIG. 1 is a left side view of a scooter type motorcycle according to the present invention.

FIG. 2 is a left side view around a vehicle body frame according to the present invention.

FIG. 3 is a plan view of a vehicle body frame, a front / rear suspension system, and a steering system according to the present invention.

FIG. 4 is an exploded perspective view of a front suspension system according to the present invention.

FIG. 5 is a left side view of the vehicle body frame according to the present invention.

6 is a view taken in the direction of arrow 6 in FIG. 5;

7 is a view taken in the direction of arrow 7 in FIG. 5;

FIG. 8 is a side sectional view of a joint portion of the vehicle body frame according to the present invention.

FIG. 9 is a rear view of a configuration in which a main stand is attached to a rear frame according to the present invention.

FIG. 10 is an explanatory view of an assembling procedure of a scooter type motorcycle according to the present invention.

FIG. 11 is a modified example of the front frame according to the present invention.

[Explanation of symbols]

1. Scooter type motorcycle, 1F: Partial assembly in front,
1R: rear subassembly, 2: body frame, 2M: middle portion of body frame, 2F: front frame, 2R: rear frame, 3: front wheel, 4: front suspension system, 5 ...
Steering system, 6 ... Swing type power unit, 7 ...
Rear wheel, 8: Rear suspension system, 15: Step floor for foot rest, 31: Stay, 33: Swing arm, 5
1: Head pipe post, 52: Head pipe, 74:
Dividing surface of front frame, 84 ... Dividing surface of rear frame, W ...
Dividing line.

Claims (2)

[Claims] 1. A front wheel is mounted on a front portion of a vehicle body frame via a swing arm, a head pipe is provided, and a footrest step floor is mounted on an intermediate portion of the vehicle body frame.
In a scooter type motorcycle in which a rear wheel is attached to a rear portion of a body frame via a swing type power unit, the vehicle body frame has a structure in which a rear frame is connected to a front frame so as to be splittable at a position below the step floor. A scooter type motorcycle characterized by: 2. A front wheel is mounted on a front portion of a vehicle body frame via a stay and a swing arm which has a head pipe and extends forward, and a stepping floor for foot mounting is mounted on an intermediate portion of the vehicle body frame. In a scooter type motorcycle in which a rear wheel is attached to a rear portion via a swing type power unit, a front portion of the vehicle body frame is
A scooter-type motorcycle, wherein the stay and the head pipe are integrally cast.